What are Pseuodcoelomate worms?

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Pseuodcoelomate worms include those in the phyla Rotifera , Gastrotricha, Kinorhyncha , Nematoda , and Nematomorpha . Of these, the largest phylum is the nematodes, which are probably the most numerous multicellular animals. Also called roundworms and threadworms, the nematodes include widespread free-living species as well as parasites, such as the hookworm . Other parasitic nematodes include Filaria, the cause of filariasis, which may result in elephantiasis ; Trichinella, the cause of trichinosis ; Ascaris, an intestinal parasite of humans, horses, and pigs; the pinworm , a parasite common in children; the Guinea worm, Dracunculus medinensis, now restricted to N sub-Saharan Africa, which is ingested as a larva in water and slowly emerges when full grown (up to 3 ft/91 cm) through a painful sore in the skin; and various other species that are agricultural pests.